New 905SE wiring modification

Sep 24, 2007
268
0
I'm not sure if it's correct to post this as a new thread, given the existing 905SE wiring fault one which I started. If not, no doubt it will be moved.

Several 905SE users have commented on the handlebar buttons on the bike, especially the two on the left. It's impossible to know by looking at them, or feeling them, if they are on or off. This means one does not know if the pedelec is switched on/off or whether the de-restrict button is on/off. Moreover, they are very easy to touch by accident and this obviously knocks off the pedelec or turns on the speed restrict or whatever, usually when riding along.

The 905e had only one switch, on the right hand side, for the throttle. The bike had the main key-operated switch and this turned everything on and off. ie there was no independent on/off for the pedelec side of things and the bike was permanently unrestricted. On the few occasions when I wanted to pedal the bike with no pedelec assistance, I just reached down and turned the main switch off and this was a lot easier than frantic button pressing on the SE.

Tonight, on my 905SE, I removed the entire left switch assembly and permanently connected up the pedelec on/off circuit. This means that the pedelec mode is ON when the main key switch is turned (like on the 905e). My logic here is that 99% of the time I want pedelec assistance and, for the odd time when not (usually only when trying to conserve battery power after a long run), it's easy to use the key.

I also bypassed the speed restrictor so that the bike is permanently unrestricted. My reasoning here is that, other than adhering to what I regard as a legal technicality which no policeman has ever to my knowledge pursued, there is no point in riding a bike that's restricted (the 905e wasn't anyway).

Finally, I removed the unreadable, unreliable and useless speedo/battery indicator. Again this is easy enough...just a matter of using the wiring diagram to disconnect one of the block connectors near the controller. I replaced it with a wired digital speedo/odometer/clock from my mountain bike.. the type that has a small magnet on one of the front wheel spokes.

The wiring modifications are easy and I've been out for a test ride with no problems. If anyone wants to know what to do, just let me know.

I'm going to change the throttle switch to one which clearly shows whether it's on or off. The one that's on the bike can be ON without one knowing and, being just a mechanical click switch, it will stay on unless you click it off, even if you turn off the main key and turn it on again. So there's a possibility of inadvertantly twisting the throttle and taking off when not required, say when manouevring the bike to park it or whatever.
 

frank9755

Esteemed Pedelecer
May 19, 2007
1,228
2
London
Good modifications, Jimmy, which will improve the usability of the bike.

I never (intentionally) use the left hand switches, and twisted them round away from my hand to avoid accidentally pressing them, but they could be removed.

The central console has two uses as I see it. Firstly it is the thing that lights up when the you turn the bike on, confirming that it is on. Secondly it provides a useful stand when you turn the bike over for maintenance, preventing any more useful handlebar attachments being damaged. Beyond that, as you say, it is not terribly useful. I was going to remove mine initially but I finally decided that these two factors just made it worthwhile. I've fitted a normal cycle computer too.

A light on the throttle switch would be helpful too.

I recall from one of David's posts that they are planning to rationalise the buttons on the next release, but doing all of your modifcations would be sensible.

Frank
 

flecc

Member
Oct 25, 2006
53,409
30,742
Thanks Jimmy, sounds like a very useful simplification of the controls.
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Sep 24, 2007
268
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By the way. I found a supplier in China who can supply controllers for $40.50 including airmail delivery. That's about £21 at today's exchange rates. That's for a controller made by the same factory that supply Wisper. I thought at that price it's worth having a spare one, so I ordered one today.

The same person can also get hold of lots of other sorts of controller, some for as little as £12 for brushed, brushless, Hall effect etc motors....

If anyone wants the details, just let me know. The seller, Heywin, can get a controller for you easily, especially if you send him a photo of the one you have, with all the Chinese writing on it...